2006 Toyota Sequoia brakes problems

Toyota sequoia (ball joints recall) was driving on highway I-5 northbound just after the bridge that goes over the sacramento river I was on the bypass/cosway bridge driving in the #1 (of 2) lane going 65 MPH when suddenly my front end driver's side of my vehicle dropped completely and I was skidding on complete metal, I had no breaks and continued to skid for what seemed like forever, and steered to my to my right passing the #2 lane going up against the edge of the right side on the bridge.

For almost a year, the vsc trac, vsc off, and emergency brake lights have been illuminated on the dash of our 2006 sequoia. It has been in for repairs six times, and many remedies have been attempted, to no avail. The three lights continue to light at random times in the past week, the master cylinder has been replaced, they have replaced and retorques sensors to spec, and replaced the booster assembly. The lights remain on.